If we are starting to see attack attempts specifically targeting OpenBSD systems, it could be an indication that at least some criminals have achieved a level of skill, or at least reached a new level of ambition. I have a strong feeling that the OpenBSD developers' efforts have paid off and creating a workable exploit will be very hard, but in the meantime, now is not the time to be slacking, even if all you critical system run OpenBSD. But you have a head start.